Battle of Gettysburg - Artifacts from Fields and Forests : Washington Irving Heald's collection given to the Gleason Public Library.
Materials:
Brass
Dimensions:
Dia-0.75 inches
Information:

On the front side of the button, in relief, is an eagle with the letter "A" in its shield. On the backside, "Waterbury Button Co." is inscribed. The loop ring is bent.

The A in the center means Artillery.
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